Allowing company to connect to multiple users

src/main/java/net/gepafin/tendermanagement/constants/GepafinConstant.java

@@ -178,5 +178,5 @@ public class GepafinConstant {
 	public static final String INVALID_EMAIL = "invalid.email";
 	public static final String UNAUTHORIZED = "UNAUTHORIZED";
 	public static final String COMPANY_ID_MANDATORY = "company.id.mandatory";
-	
+    public static final String USER_ALREADY_CONNECTED_TO_COMPANY = "user.already.connected.to.company";
 }

src/main/java/net/gepafin/tendermanagement/dao/CompanyDao.java

@@ -34,13 +34,27 @@ public class CompanyDao {
 	private UserWithCompanyRepository userWithCompanyRepository;
 
 	public CompanyResponse createCompany(UserEntity userEntity, CompanyRequest companyRequest) {
-		validateCompany(companyRequest);
-		CompanyEntity companyEntity = convertCompanyRequestToCompanyEntity(companyRequest);
-		companyRepository.save(companyEntity);
-		createUserWithCompanyRelation(userEntity, companyEntity);
-		return convertCompanyEntityToCompanyResponse(companyEntity);
+		CompanyEntity existingCompany = companyRepository.findByVatNumber(companyRequest.getVatNumber());
+		if (existingCompany != null) {
+			UserWithCompanyEntity existingRelation = userWithCompanyRepository.findByUserIdAndCompanyId(userEntity.getId(), existingCompany.getId())
+					.orElse(null);
+			if (existingRelation == null) {
+				createUserWithCompanyRelation(userEntity, existingCompany);
+			} else {
+				throw new CustomValidationException(Status.VALIDATION_ERROR,
+						Translator.toLocale(GepafinConstant.USER_ALREADY_CONNECTED_TO_COMPANY));
+			}
+			return convertCompanyEntityToCompanyResponse(existingCompany);
+		} else {
+			validateCompany(companyRequest);
+			CompanyEntity companyEntity = convertCompanyRequestToCompanyEntity(companyRequest);
+			companyRepository.save(companyEntity);
+			createUserWithCompanyRelation(userEntity, companyEntity);
+			return convertCompanyEntityToCompanyResponse(companyEntity);
+		}
 	}
 
+
 	private void validateCompany(CompanyRequest companyRequest) {
 		
 		if (Boolean.FALSE.equals(StringUtils.isEmpty(companyRequest.getEmail()))

src/main/java/net/gepafin/tendermanagement/repositories/CompanyRepository.java

@@ -13,5 +13,6 @@ public interface CompanyRepository extends JpaRepository<CompanyEntity, Long> {
 	List<CompanyEntity> findByIdIn(List<Long> companyIds);
 
 	Boolean existsByVatNumber(String vatNumber);
+	CompanyEntity findByVatNumber(String vatNumber);
 
 }

src/main/resources/message_en.properties

@@ -205,3 +205,4 @@ vatnumber.mandatory=VatNumber is mandatory.
 vatnumber.already.exists=VatNumber already exists. 
 invalid.email=Invalid email.
 company.id.mandatory=Company id is mandatory.
+user.already.connected.to.company=The user is already connected to this company.

src/main/resources/message_it.properties

@@ -198,3 +198,4 @@ vatnumber.mandatory=Il numero di partita IVA
 vatnumber.already.exists=Il numero di partita IVA esiste già.
 invalid.email=Email non valida.
 company.id.mandatory=L'ID dell'azienda è obbligatorio.
+user.already.connected.to.company=L'utente è già collegato a questa azienda.